<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <div id="test"></div>
    <script src="./js/react.development.js"></script>
    <script src="./js/react-dom.development.js"></script>
    <script src="./js/babel.min.js"></script>
    <script type="text/babel">
    /*
        页面中输入的数据实时的绑定到状态中，就是受控组件，现用现取就统一获取，推荐使用受控组件可以减少refs的使用
    */
        class Login extends React.Component {
            state = {username:'',password:'',}
            // 保存用户名到状态中
            saveUsername = event => this.setState({username: event.target.value})
            // 保存密码到状态中
            savePassword = event => this.setState({password: event.target.value})
            handleSubimt = event =>{
                event.preventDefault();
                const {username, password} = this.state;
                alert(username,password);
            }
            render() {
                return (
                    <form action="http://www.baidu.com/" onSubmit={this.handleSubimt}>
                        用户名：<input onChange={this.saveUsername} type="text" name='username'/>
                        密码：<input onChange={this.savePassword} type="password" name='password'/>
                        <button>登录</button>
                    </form>
                )
            }
        }
        ReactDOM.render(<Login/>,document.getElementById("test"))
    </script>
</body>
</html>